2026-06-14T00:39:33Zhttps://repisalud.isciii.es/rest/oai/requestoai:repisalud.isciii.es:20.500.12105/163792024-09-28T00:09:35Zcom_20.500.12105_2052com_20.500.12105_2051col_20.500.12105_19610
Repisalud
author
Sánchez-Soberón, Francisco
author
Pantuzza, Gabriel F
author
Fernandes, Madalena
author
Homem, Vera
author
Alves, Arminda
author
Fontes, Milton
author
André, Magda
author
Cunha, Joana
author
Ratola, Nuno
funder
Fundação para a Ciência e Tecnologia (Portugal)
funder
Unión Europea. Fondo Europeo de Desarrollo Regional (FEDER/ERDF)
funder
Ministério da Ciência Tecnologia e Ensino Superior (Portugal)
funder
Unión Europea. Fondo Social Europeo (ESF/FSE)
2023-08-30T10:55:53Z
2023-08-30T10:55:53Z
2023
Environ Res. 2023 Oct 1;234:116564.
10.1016/j.envres.2023.116564
1096-0953
0013-9351
Environmental research
37422117
http://hdl.handle.net/20.500.12105/16379
Volatile methylsiloxanes (VMSs) are a group of additives employed in different consumer products that can affect the quality of the biogas produced in wastewater treatment plants (WWTPs). The main objective of this study is to understand the fate of different VMSs along the treatment process of a WWTP located in Aveiro (Portugal). Thus, wastewater, sludge, biogas, and air were sampled in different units for two weeks. Subsequently, these samples were extracted and analyzed by different environment-friendly protocols to obtain their VMS (L3-L5, D3-D6) concentrations and profiles. Finally, considering the different matrix flows at every sampling moment, the mass distribution of VMSs within the plant was estimated. The levels of ∑VMSs were similar to those showed in the literature (0.1-50 μg/L in entry wastewater and 1-100 μg/g dw in primary sludge). However, the entry wastewater profile showed higher variability in D3 concentrations (from non detected to 49 μg/L) than found in previous studies (0.10-1.00 μg/L), likely caused by isolated releases of this compound that could be related to industrial sources. Outdoor air samples showed a prevalence of D5, while indoor air locations were characterized by a predominance of D3 and D4. Differences in sources and the presence of an indoor air filtration system may explain this divergence. Biogas was characterized by ∑VMSs concentrations (8.00 ± 0.22 mg/m3) above the limits recommended by some engine manufacturers and mainly composed of D5 (89%). Overall, 81% of the total incoming mass of VMSs is reduced along the WWTP, being the primary decanter and the secondary treatment responsible for the highest decrease (30.6% and 29.4% of the initial mass, respectively). This reduction, however, is congener dependant. The present study demonstrates the importance of extending sampling periods and matrices (i.e., sludge and air) to improve sample representativity, time-sensitivity, and the accuracy of mass balance exercises.
eng
Biogas
Green chemistry
Indoor air
Mass balance
Volatile methylsiloxanes
Wastewater treatment plants
Helping WWTP managers to address the volatile methylsiloxanes issue-Behaviour and complete mass balance in a conventional plant
research article
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Suplementary1_HelpingWWTP_ManagersAddress_2023.pdf
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HelpingWWTP_ManagersAddress_2023.pdf.txt
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